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(Vcharset_non_preferred_head): New variable.

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(Vcurrent_iso639_language): New variable.
(syms_of_charset): Declare it as a Lisp variable.
(char_charset): Don't check non preferred charsets.  As a last
resort, return charset_unicode.
(Fset_charset_priority): Update Vcharset_non_preferred_head.
This commit is contained in:
Kenichi Handa 2008-05-14 01:22:48 +00:00
parent 370cefff00
commit 6a9c90ecda
1 changed files with 17 additions and 3 deletions
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20
src/charset.c
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@ -97,6 +97,10 @@ int charset_unibyte;
/* List of charsets ordered by the priority. */
Lisp_Object Vcharset_ordered_list;
/* Sub-list of Vcharset_ordered_list that contains all non-preferred
charsets. */
Lisp_Object Vcharset_non_preferred_head;
/* Incremented everytime we change Vcharset_ordered_list. This is
unsigned short so that it fits in Lisp_Int and never matches
-1. */
@ -118,6 +122,8 @@ Lisp_Object Vcharset_map_path;
Lisp_Object Vchar_unified_charset_table;
Lisp_Object Vcurrent_iso639_language;
/* Defined in chartab.c */
extern void
map_char_table_for_charset P_ ((void (*c_function) (Lisp_Object, Lisp_Object),
@ -1810,7 +1816,8 @@ char_charset (c, charset_list, code_return)
if (NILP (charset_list))
charset_list = Vcharset_ordered_list;
while (CONSP (charset_list))
while (CONSP (charset_list)
&& ! EQ (charset_list, Vcharset_non_preferred_head))
{
struct charset *charset = CHARSET_FROM_ID (XINT (XCAR (charset_list)));
unsigned code = ENCODE_CHAR (charset, c);
@ -1823,7 +1830,8 @@ char_charset (c, charset_list, code_return)
}
charset_list = XCDR (charset_list);
}
return NULL;
return (c <= MAX_UNICODE_CHAR ? CHARSET_FROM_ID (charset_unicode)
: CHARSET_FROM_ID (charset_eight_bit));
}
@ -1994,7 +2002,7 @@ usage: (set-charset-priority &rest charsets) */)
}
}
arglist[0] = Fnreverse (new_head);
arglist[1] = old_list;
arglist[1] = Vcharset_non_preferred_head = old_list;
Vcharset_ordered_list = Fnconc (2, arglist);
charset_ordered_list_tick++;
@ -2133,6 +2141,12 @@ syms_of_charset ()
doc: /* List of all charsets ever defined. */);
Vcharset_list = Qnil;
DEFVAR_LISP ("current-iso639-language", &Vcurrent_iso639_language,
doc: /* ISO639 language mnemonic symbol for the current language environment.
If the current language environment is for multiple languages (e.g. "Latin-1"),
the value may be a list of mnemonics. */);
Vcurrent_iso639_language = Qnil;
charset_ascii
= define_charset_internal (Qascii, 1, "\x00\x7F\x00\x00\x00\x00",
0, 127, 'B', -1, 0, 1, 0, 0);